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https://issues.apache.org/jira/browse/TINKERPOP-2959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17901256#comment-17901256
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ASF GitHub Bot commented on TINKERPOP-2959:
-------------------------------------------
vkagamlyk commented on code in PR #2919:
URL: https://github.com/apache/tinkerpop/pull/2919#discussion_r1858905958
##########
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/GType.java:
##########
@@ -0,0 +1,103 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tinkerpop.gremlin.process.traversal.step;
+
+import org.apache.tinkerpop.gremlin.process.traversal.Path;
+import org.apache.tinkerpop.gremlin.structure.Edge;
+import org.apache.tinkerpop.gremlin.structure.Property;
+import org.apache.tinkerpop.gremlin.structure.Vertex;
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * An enum that describes types that are used in the Gremlin language.
+ */
+public enum GType {
+ BIG_DECIMAL(BigDecimal.class),
+ BIG_INTEGER(BigInteger.class),
+ BOOLEAN(Boolean.class),
+ DOUBLE(Double.class),
+ EDGE(Edge.class),
+ INTEGER(Integer.class),
+ LIST(List.class),
+ LONG(Long.class),
+ MAP(Map.class),
+ PATH(Path.class),
+ PROPERTY(Property.class),
+ SET(Set.class),
+ STRING(String.class),
+ UNKNOWN(null),
+ VERTEX(Vertex.class);
+
+ private Class<?> javaType;
+
+ GType(final Class<?> javaType) {
+ this.javaType = javaType;
+ }
+
+ public Class<?> getJavaType() {
+ return this.javaType;
+ }
+
+ /**
+ * Returns {@code true} if the type is a number.
+ */
+ public boolean isNumeric() {
+ return this == INTEGER || this == DOUBLE || this == LONG || this ==
BIG_INTEGER || this == BIG_DECIMAL;
+ }
+
+ /**
+ * Returns {@code true} if the type is a collection.v
+ */
+ public boolean isCollection() {
+ return this == LIST || this == SET;
+ }
+
+ /**
+ * Returns {@code true} if the type is an element.
+ */
+ public boolean isElement() {
+ return this == VERTEX || this == EDGE;
+ }
+
+ /**
+ * Convert an object to a matching {@link GType} and if not matched return
{@link GType#UNKNOWN}.
+ */
+ public static GType getType(final Object object) {
+ if (object instanceof String) return STRING;
Review Comment:
may be better to introduce `Map<Class, GType>` with mapping?
> Allow the grammar to support parameters
> ---------------------------------------
>
> Key: TINKERPOP-2959
> URL: https://issues.apache.org/jira/browse/TINKERPOP-2959
> Project: TinkerPop
> Issue Type: Improvement
> Components: language
> Affects Versions: 3.6.4
> Reporter: Stephen Mallette
> Assignee: Stephen Mallette
> Priority: Major
> Fix For: 3.7.0
>
>
> Allow the grammar to support parameters similar to how the groovy engine does
> like, {{g.inject(x,y,z)}}. Doing this will make it easier for a transition
> away from the groovy engine as a lot of Gremlin in the world today uses
> parameters. The grammar may have to come with some limitations though as
> groovy is wide open in terms of what can be treated as a variable. Probably
> going to keep parameters tied to primitives, collections and tokens/enums
> like {{Order}} and {{Scope}}. Collections themselves will not contain
> parameters and things like a {{Traversal}} or {{P}} cannot be treated as one.
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